Retaining means for spindles of deep-well rotary cutters



f l 1,636,669 July 191927 F. K. BLAUVELT RETAINING MEANS FOR SPIN'JLES OF DEE? WELL ROTARY CUTTERS F'iledMarch 15. 1927 Inuel'or.'

Hed Jlauvgl',

Patented July 19, 1927.

N UNITED STATES PATENT OFFICE.

'FEED `II'. BLAUVELT, or WICHITA, KANSAS, AssIGNoE To CLARENCE E. REED, or

. WICHITA, xANsAs.

RETAINING MEANS FOR SPINDLES F DEEP-WELL ROTARY CUTTERS.

Application led March 15, 1927. Serial No. 175,570.

The invention concerns rotary earth boring drills and particularly means for holding the cuttting unit to the bit head, said means being adapted to draw the shank of said cutting unit firmly seated `in place,

thereby eliminating all play, and contribut- "ing to a ruggedness of the structure to sustain'the great strains to which said tools are subjected.

In the drawings forming a part of the i specification "7 vFigure lis a part section and elevation of.

abit head embodying the invention.

Fig.'2 is a plan view of the cu'ttitng unit shank. f Fig.4 3 is aside view of the holding means. Fig. 4 isa vertical sectional view ot said holding means.

, Fig. 5 is a sectional view at a quarter turn from Fig; 4. l Fig. 6 is a bottom plan ying unit. v

In these drawings l is the bit head. The cutting unit comprises a spindle 5 with a rotary cutter 3 mounted thereon in any suitable manner. This unit has a shank 6X eX- view of said hold tending up into a socket 7* in the bit' head.

Atthe upper end of the socket there is a recess in the side of the bit head and the 30 This upperend` is provided with wings 31 with gates 32 between them forming one part of a bayonet joint, the other pai-tof said Vjoint being on the holding means which is located in the recess. This holding means comprises an inverted cup shaped member made in sections 33, 34. The section 33 has end is riveted in place or headed at 35a so I that it may turn in 'the cross piece. The screw threaded part of the operating member 35 works in a screw threaded 'openlng 1n the top of the cup shaped member 33. At

upper `end vof the shank extends thereinto.

its upper end it is provided with openings 35c toreceive an implement by which said operating member may be turned. When turned one way the operating member will raise the member' or section V33 and when turned the other way it will lower said section. The cup shaped member is slabbed off at 35d to present a straight shoulder at this point.

In the use of the holding means it is placed overthe projecting upper end of the shank 5* of the unit so that its gates 34a will register with the wings 31 and its flangeswill be in line vertically with 'the gates 32 onv said shank. `It will Jthen be lowered to rest on the bottom oi the recess. Its lianges will then be in a plane below the plane of the wings or flanges on the upper end of the shank. Thereupon the entire cup shaped member is given a quarter turn which will cause its flanges 33a to ride under the flanges or wings 31 on the shank. In thisI position the holding means has interlocked with the shank to hold it within the socket in the head. A Cotter pin now may be run through openings inthe bit head so as to lie along the straight shoulder 35d and thus the holding means will kbe retained in position against rotary displacement.

Now in order to draw the shank of the unit tightly within the bit head the operating member 35 is turned, and by its screw threaded connection it draws upwardly upon the main section 33 of the inverted cup shaped member. In this action the screw threaded operating member finds a seat against the cross piece of the supplemental or auxiliary section of the cup shaped member. In its upward movement the main section 33 b its flanges which engage under the wings o the shank draw said 'shank upwardly tightly into or against the bit head. It will be observed that at the junction of. the spindle and shank there is desirably a base flange 11x. This is seated in a recess 12X and against the ceiling thereof and the action just described will draw the said flange into firm engagement with the said ceiling. By means of this tightener 'the cutting unit will be held against play and the bit head will not have a hammer action upon the unit during the operation of boring the hole.

I claim as my invention:

1. In combination in an earth boring drill a bit head, a roller cutter unit comprising a head to draw the shank firmly to its seat roller, spindle and shank, said shank having a iange and gate at its upper end, and

f means for drawing and holding theshank into the head, comprising a member having a flange and gate complementary to t'he flange and gate of the shank, said member when moved yaxially .of the shank I.and thenH turned bringing its 'fia'nge beneath that of the shank, and operating means for drawing said member upwardly relativeto the drill *,hebit head, substantially as described.

2.l Locking mean-s tor the shank according i Vtoclaim 1 in which means are provided for J.'

preventing retrograde rotary .movement 0i the said holdingQn'ieinber.` to maintain its.` flange beneath kand engaged with tliefiange on the shanl'; of the cutting unit, lsubstaii tially as described.

3. Holding meansfior the shankv of the cutter `unit in accordance with claim 1 in(v which the operating :means comprises* a screw threaded member passing' 'through the` holding means," and a yn'itniber to restupon the bit head `in which said'screw threaded member lis supported vand to which itis ,swive ell'ed, substantially as desci'ibed.- Y

4f. Holding and drawing means -i'or the shank of a cutter unitrcompri'sing' a' member having a fiange and gate complen'ientary to Va flange and gate on the shank, a secondl member to rest upon the bit head, anda screw threaded operating member swivelled in said 4second'member and passing through and'in` screw' threaded engagement with the first member, substantially as described. 5.1 In combination with abit vhea-d a roF tary cutter unit having a rotary cutter, a spindle and shank, said shank beineseated" insaid bit head, said bit head having a recess in its side, holding ineans'in saidl recess having a bayonet joint connection with the upper end ofthe shank and means 'for drawing said holding` member upwardly relative' to the bit head in the direction `oi the airisy a. cut.-

part vof the bit head and a support vfor said operating member, Y another section operated by Saidscrew threaded member and having a fiange and gate Vto cooperatel with a 'fiange'an'd 4vgate "on shank, said iianges engaging when the cup shaped member turned .about'the axis of the shank, and means for vretaining Said holding @means against backward turning, substantially as described.

7. In combination a bist headuhaving a socket, -a 'rotary cutter unit having fa Shank" in saidk socltet, said head :havin-g :a recess its side into which the upper end oftheIv shank projects, a substantially inverted shaped holding means inv saidfrecessiomedin sections, one section being supported al; the bottom oizsai-d recess, and theotlaer see-y tion having a bayonet joint connectionfwi 1 the shank, an operating member :swiveiled to the section iirst mentioned .and

through and having screw, threaded angstigeinent with Vthe other section to raise alndf lower the lsame in; respect to :the first and means for holding' the said cup shipan` member against backwardtumn .Whente bayonet joint scribed.

8. In connection With the featunes'iof is set, lsubs'tanti ly as dei', a flat shoulder or seat on one section modi a pinseated removably in the `bid'l headjnd engagingsaid shoulder or seat to hold-the Vcup shaped member 'against backward turliing, substantially as described.-

9. Holding means tori the shank'of aum-f tary cutter unit comprising `an inverted cup;` shaped `member of cylindrical .form insee, tions, one section .having segmemtai` Walls"` located between the segmental walls of time other section 'and circumferentially iiniliine'f therewith., one section having aV cross piece',

a screw threadedV 'operating member. 'swivelled in said cross piece,:and passing through and engaging vaA screw threadedopeninigfim the other .sectioii, so that the latter may be"- .drawn vertically in relation to the first menitioned section, said second section having u.k flange and gate to cooperate with a comple-V mentary flange: and gate on the saidV other4 section, substantially a's'=described;. e., In testimony whereof, I afIixmysigna-H anni) K. niinuvnim. y

ture. 

